storage issue

Dear all,
i have qmail server having only 10 GB capacity of harddrive.
when it was install we dont have that much requirement we have limited user
but now our user incresed so that 10 GB capacity is not enough, so i try to
connect one more hard drive in secondry with existing setup and take backup
using rsync and then link original directory with backup copy which is i
taken by rsync.actually i want the actual mail server hard drive only point
out the secondry hard drive location and store mail in it. but in
practically it not happen all the mails stored in same location where they
stored previously,please guide me how can i do setup so that i can store all
my mails in new drive.

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